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40 Flap additional moments produced Aileron air density airplane center airplane pitching angle of attack arm perpendicular distance attributed to additional center of gravity climbout and descent commercial jet transport conditions analyzed CONDITIONS AND PROCEDURES Configuration airspeed configuration landing gear cruise configurations deflection maximum differences are attributed distance from thrust due to thrust effect of engine elevator deflection engine nacelle flow engine net thrust ENGINE THRUST EPR approximately Flap deflection Flight tests flow and engine gear up Stabilizer geometric moment arm increasing flap angle Indicated airspeed interaction between wing Jet engine jet-induced downwash kg-m2 slug-ft2 knots flaps Langley Research Center Mach number Moments of inertia NACA nacelle normal force NASA TM outboard Performing Organization pitching moment due produced by nacelle Slope average Stabilizer angle tapes test airplane TEST CONDITIONS thrust axis thrust change thrust on airplane twin-engine commercial jet U.S. Customary Units VARIATION OF PITCHING wing flow